# no conversion from DWI to DTI

**URL:** <https://discourse.slicer.org/t/no-conversion-from-dwi-to-dti/6695>\
**Category:** Support\
**Created:** [May 5, 2019, 12:56pm UTC](https://discourse.slicer.org/t/no-conversion-from-dwi-to-dti/6695 "2019-05-05T12:56:06Z")\
**Posts on this page:** 16\
**Page:** 1

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**Author:** ![ecgt](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/ecgt/32/17012_2.png) [@ecgt](https://discourse.slicer.org/u/ecgt)\
**Post date:** [May 5, 2019, 12:56pm UTC](https://discourse.slicer.org/t/no-conversion-from-dwi-to-dti/6695/1 "2019-05-05T12:56:06Z")

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Operating system:Windows  
Slicer version:4.4.0  
Expected behavior:transform DWI to DTI  
Actual behavior:completed with errors  
MR: GE 3T

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**Author:** ![ljod](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/ljod/32/652_2.png) [@ljod](https://discourse.slicer.org/u/ljod)\
**Post date:** [May 5, 2019, 1:18pm UTC](https://discourse.slicer.org/t/no-conversion-from-dwi-to-dti/6695/2 "2019-05-05T13:18:55Z")

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Hi we need a lot more information to help you. What version of Slicer? What exact modules did you use? In what order? What happened at the end and how did the output look? What was the error message? Thanks.

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**Author:** ![ecgt](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/ecgt/32/17012_2.png) [@ecgt](https://discourse.slicer.org/u/ecgt)\
**Post date:** [May 5, 2019, 1:58pm UTC](https://discourse.slicer.org/t/no-conversion-from-dwi-to-dti/6695/3 "2019-05-05T13:58:16Z")

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I used the version 4.4.0 that I always use. I started with DICOM converter and I converted to nrrd

It did that. After that I did the DWI to DTI conversion and ended up with Completed with errors and I cannot get further.

The file was from a 3T GE

I work with a 1.5 GE and with a 3T Siemens withot any problem

Thanks for helping!!!

Eduardo

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**Author:** ![doc-xie](https://avatars.discourse-cdn.com/v4/letter/d/c77e96/32.png) [@doc-xie](https://discourse.slicer.org/u/doc-xie)\
**Post date:** [May 5, 2019, 2:07pm UTC](https://discourse.slicer.org/t/no-conversion-from-dwi-to-dti/6695/4 "2019-05-05T14:07:00Z")

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Hi,Lauren,  
I think the problem is the same one as I come across some days before. The data of GE scanner should be converted into nifti with dcm2niix for tractography. So I think we should update or add some opinions in our dMRI module as soon as possible.  
Best wishes,  
Xie

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**Author:** ![ecgt](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/ecgt/32/17012_2.png) [@ecgt](https://discourse.slicer.org/u/ecgt)\
**Post date:** [May 5, 2019, 2:10pm UTC](https://discourse.slicer.org/t/no-conversion-from-dwi-to-dti/6695/5 "2019-05-05T14:10:00Z")

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![16 components.JPG](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/2X/b/b968fe18406774405c516f34fcf0d7fbc14b83c3.jpeg)

 ![error.JPG](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/2X/b/b80af593a2a0e8fee7ad98323b436d5a203f7e03.jpeg)

I checked the components and there are 16 components .I use generally 37 components Can this be the cause?

Thanks

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**Author:** ![ljod](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/ljod/32/652_2.png) [@ljod](https://discourse.slicer.org/u/ljod)\
**Post date:** [May 5, 2019, 2:31pm UTC](https://discourse.slicer.org/t/no-conversion-from-dwi-to-dti/6695/6 "2019-05-05T14:31:35Z")

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Hi Eduardo (and hello Dr. Xie!).

We have made a new module to replace DWIConvert moving forward. It has recently become available in Slicer nightly version. It is called SlicerDcm2nii and you can install it from the extension manager.

There is a lot of active development happening in the Slicer nightly right now. Today is a good download: I checked today’s dashboard and SlicerDMRI and SlicerDcm2nii and UKFTractography are all built.

Please do an experiment and download the nightly build version of Slicer and test this new SlicerDcm2nii module for converting your data. You shouldn’t need to remove your current Slicer to do this (you should be able to name this one differently and have two installations, for example).

Let us know how this works for you!

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**Author:** ![ecgt](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/ecgt/32/17012_2.png) [@ecgt](https://discourse.slicer.org/u/ecgt)\
**Post date:** [May 5, 2019, 10:11pm UTC](https://discourse.slicer.org/t/no-conversion-from-dwi-to-dti/6695/7 "2019-05-05T22:11:38Z")

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I tried the SlicerDcm2nii and send an error message

I run the new software and finally it appears a dark image, bright margins

When doing FA there is a distorted image and DTI color shows areas of red , and grey, lokking distorted. I can recognize genu, splenium and cingulum in red.

Thanks!!

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**Author:** ![ljod](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/ljod/32/652_2.png) [@ljod](https://discourse.slicer.org/u/ljod)\
**Post date:** [May 6, 2019, 10:03am UTC](https://discourse.slicer.org/t/no-conversion-from-dwi-to-dti/6695/8 "2019-05-06T10:03:39Z")

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Hi this is not enough information for us to help.

What was the error message? Did you get any output DWI from SlicerDCM2nii? Did you use this output for anything?

What “new software” do you mean? What “image” were you viewing? (DWI? tensors?)

What do you mean by “distorted”? Spatially distorted? The wrong colors? Can you share a screenshot that does not contain any patient identifying information?

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**Author:** ![ecgt](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/ecgt/32/17012_2.png) [@ecgt](https://discourse.slicer.org/u/ecgt)\
**Post date:** [May 6, 2019, 11:25am UTC](https://discourse.slicer.org/t/no-conversion-from-dwi-to-dti/6695/9 "2019-05-06T11:25:00Z")

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I sent you the pictures but the mail was rejected because of the pictures

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<div class="post-metadata">

**Author:** ![ljod](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/ljod/32/652_2.png) [@ljod](https://discourse.slicer.org/u/ljod)\
**Post date:** [May 6, 2019, 12:26pm UTC](https://discourse.slicer.org/t/no-conversion-from-dwi-to-dti/6695/10 "2019-05-06T12:26:40Z")

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Thanks. I still cannot try to help because I cannot yet understand exactly what you did or what happened. Please do answer some of the questions above in my previous post. Also, if you go to the website you should be able to post updated pictures without needing email.

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**Author:** ![doc-xie](https://avatars.discourse-cdn.com/v4/letter/d/c77e96/32.png) [@doc-xie](https://discourse.slicer.org/u/doc-xie)\
**Post date:** [May 10, 2019, 8:40am UTC](https://discourse.slicer.org/t/no-conversion-from-dwi-to-dti/6695/11 "2019-05-10T08:40:12Z")

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Hi Lauren,  
I have installed the nightly version and run the SlicerDcmenii. The module can work correctly, but sometimes the converted files can not be found in time. I do not know the reason about this. So I have to run the module several times. As a result, a lot of files are produced in the dictionary. Why not set an additional opinion of “output dictionary” in the module?  
Best wishes,  
Xie

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<div class="post-metadata">

**Author:** ![ljod](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/ljod/32/652_2.png) [@ljod](https://discourse.slicer.org/u/ljod)\
**Post date:** [May 10, 2019, 12:01pm UTC](https://discourse.slicer.org/t/no-conversion-from-dwi-to-dti/6695/12 "2019-05-10T12:01:51Z")

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Hi Dr Xie. Thanks for trying the module! The module converts to nrrd and loads this DWI into Slicer. The module should not change any DICOM dictionary at all. Could you please explain in more detail what steps you used and where you saw this dictionary output? What do you mean by dictionary? (You do not need to load the DICOM into slicer. Just give the dcm2nii module the DICOM directory or folder that only contains the DWI.)

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<div class="post-metadata">

**Author:** ![doc-xie](https://avatars.discourse-cdn.com/v4/letter/d/c77e96/32.png) [@doc-xie](https://discourse.slicer.org/u/doc-xie)\
**Post date:** [May 16, 2019, 8:27am UTC](https://discourse.slicer.org/t/no-conversion-from-dwi-to-dti/6695/13 "2019-05-16T08:27:42Z")

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Hi Lauren,  
I mean the converted files can not be found in the same DICOM dictionary. So I think we should add an output folder opinion that the converted files can be used correctly. The details about this problem are belows.

 ![15%20PM](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/5/2/52622beb19a7f0ec6d784c847d74f2eb47b759fd.png) !  
[09%20PM|690x479](https://discourse.slicer.org/404)  
Best wishes,  
Xie

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<div class="post-metadata">

**Author:** ![doc-xie](https://avatars.discourse-cdn.com/v4/letter/d/c77e96/32.png) [@doc-xie](https://discourse.slicer.org/u/doc-xie)\
**Post date:** [May 16, 2019, 8:28am UTC](https://discourse.slicer.org/t/no-conversion-from-dwi-to-dti/6695/14 "2019-05-16T08:28:55Z")

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![09%20PM](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/8/1/811d4b74fdd837c22d70b5695943a0bbf81f91b1.jpeg)  
In the same folder, the converted files(bval bvec…) can not be found.

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<div class="post-metadata">

**Author:** ![ljod](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/ljod/32/652_2.png) [@ljod](https://discourse.slicer.org/u/ljod)\
**Post date:** [May 16, 2019, 12:54pm UTC](https://discourse.slicer.org/t/no-conversion-from-dwi-to-dti/6695/15 "2019-05-16T12:54:17Z")

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Hi Dr. Xie!

The module just loads the data into Slicer. Do you see the DWI data in Slicer after you run the module?

It does not save as bval and bvec. To save the data you can save from Slicer as nrrd. Will that work for your needs?

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<div class="post-metadata">

**Author:** ![doc-xie](https://avatars.discourse-cdn.com/v4/letter/d/c77e96/32.png) [@doc-xie](https://discourse.slicer.org/u/doc-xie)\
**Post date:** [February 8, 2020, 2:58am UTC](https://discourse.slicer.org/t/no-conversion-from-dwi-to-dti/6695/16 "2020-02-08T02:58:09Z")

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Sorry for my later reply.  
The dcm2niiGUI module works well for my data.  
Best wishes,  
Xie